White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye

Lee, Hang Ken; Kim, Tae Ho; Park, Jae Hyung; Kim, Jai Kyeong; Park, O. Ok

doi:10.1016/j.orgel.2011.03.001

Cited by 23 publications

(13 citation statements)

References 20 publications

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“…Porous organic polymers have gained a lot of attentions for their amorphous and crystalline materials with versatile applications in biomedical, gas storage and separation, construction materials catalyst, lithium ion batteries, membrane filters sensors, and electro-optical displays, because of their low density, high surface areas, and good thermal stability [11][12][13][14][15][16][17][18][19]. Ordered and tunable pores porous organic frameworks can be obtained by changing building blocks or their contents.…”

Section: Introductionmentioning

confidence: 99%

Pyrene-based hyperbranched porous polymers with doped Ir(piq)2(acac) red emitter for highly efficient white polymer light-emitting diodes

Zhao

et al. 2020

Organic Electronics

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Here, we designed and prepared a series of hyperbranched porous polymers constructed using fluorene branches and pyrene core, and all hyperbranched porous polymers exhibit intense blue fluorescence, good morphological stability, and high thermal stability. Further, it is found that the aperture sizes for hyperbranched porous polymers can be adjusted by simply changing the content of pyrene and fluorene in the synthesis process. When the feed ratios of pyrene in the total polymers is 15 mol%, the optimized aperture size was obtained, which is slightly larger than the maxlength of complementary red emitter Bis(1phenylisoquinoline)(acetylacetonate) iridium (III) (Ir(piq)2acac), indicating the Ir(piq)2acac can well distributed in the apertures of hyperbranched porous polymers in co-doped film of Ir(piq)2acac and hyperbranched porous polymers. The fabricated polymer-light-emitting diode (PLED) with such co-doped film as light-emitting layer realizes good white emission with almost equal blue and red emission intensity from hyperbranched porous polymers and Ir(piq)2acac. The balanced electroluminescent (EL) spectra contribute to ideal Commission Internationale de l'Eclairage (CIE) coordinate of (0.326, 0.374) located at white light zone. In addition, the device also achieves high device performance with maximum luminance and current efficiency reaching 5369 cd/m 2 and 8.35 cd/A, respectively. We believe that such porous-structure polymers have huge potential applications in the development of highly efficient white PLEDs with reducing production cost.

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Section: Introductionmentioning

confidence: 99%

Pyrene-based hyperbranched porous polymers with doped Ir(piq)2(acac) red emitter for highly efficient white polymer light-emitting diodes

Zhao

et al. 2020

Organic Electronics

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“…The ancillary ligand 5-Br-2,2′-bpy was obtained from the Stille coupling reaction [14] between 2,5-dibromopyridine and 2-(tributylstannyl) pyridine in the presence of Pd(PPh3)4 (0). As to the series of dihydrate Ln 3þ -complex precursors [Ln(acac)3(H2O)2] (Ln ¼ La, Sm or Gd), they were synthesized according the well-established procedure from the literature [15].…”

Section: Methodsmentioning

confidence: 99%

“…Through the Stille coupling reaction [14] between 2,5-dibromopyridine and 2-(tributylstannyl)pyridine in the presence of Pd(PPh3)4 (0), the ancillary ligand 5-Br-2,2′-bpy was obtained in the yield of 67%. Further based on the reaction of equimolar amount of the Ln 3þ -complex precursor [Ln(acac)3(H2O)2] (Ln ¼ La, Sm or Gd) [15] and the ancillary ligand 5-Br-2,2′-bpy, also as shown in Scheme 1, the series of ternary tris-β-diketonate-Ln 3þ complexes 1-3 were obtained in 69-78% yields, respectively.…”

Section: Wpleds' Fabrication and Characterizationmentioning

confidence: 99%

Ternary complex [Sm(acac)3(5-Br-2,2′-bpy)] for the solution-processed white polymer light-emitting diode (WPLED)

Liu

Wang

et al. 2020

Optical Materials

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In consideration of the Sm 3þ -centered characteristic orange-light as the ideal color-primary component toward a dichromatic white-light, herein, through the doping of the complex [Sm(acac)3(5-Br-2,2 0 -bpy)] (2; Hacac ¼ acetylacetone; 5-Br-2,2′-bpy ¼ 5-Br-2,2 0 -bipyridine) into the PVK (PVK ¼ poly(N-vinyl-carbazole)) host, the obtained PVK@2 film (10:1, wt/wt) exhibits the straightforward solid-state white-light (ΦPL ¼ 6.7%). Further using the PVK@2 film (10:1; wt/wt) as the emitting layer, its singlecomponent solution-processed WPLED gives the electroluminescent performance (L Max of 360.9 cd/m 2 , η Max c of 1.08 cd/A) satisfactory enough for portable full-color flat displays.

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“…Various approaches, such as single white light polymers [11,12], exciplex [13], multiple blending [14] and utilization of tandem device [15,16], have been reported to realize white emission. Thereinto, multiple blending should be the advisable means to achieve high CRI white emission considering the simple device structure especially for the solution processed.…”

Section: Introductionmentioning

confidence: 99%

Efficient, stable and high color rendering index white polymer light-emitting diodes by restraining the electron trapping

Sun

et al. 2020

Organic Electronics

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Superior solid-state light source should possess not only a high device efficiency but also high color rendering index (CRI) and excellent color stability. Here, we obtained efficient, stable and high CRI white polymer light-emitting diodes (WPLEDs) through applying the well-chosen trichromatic polymers and restraining the electron trapping. The trichromatic polymers all possess the similar mainchain units, their EL spectra shows an equidistant distribution. Detailed studies revealed that the part of green and red emission in the WPLED derive from the electron trapping which led to the current-dependent spectra. Applied proper electron transporting layer can enhance the direct electron injection which resulted in the electron trapping being restrained and improving the color stability. The optimized WPLED got a LEmax of 10.17 cd A 1 and CRI of 92, the CIE coordinates (0.346, 0.345) almost keep the same with the operating current density increasing from 10.53 mA cm 2 to 263.16 mA cm 2 .

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White-light-emitting diodes using miscible polymer blend doped with phosphorescent dye

Cited by 23 publications

References 20 publications

Pyrene-based hyperbranched porous polymers with doped Ir(piq)2(acac) red emitter for highly efficient white polymer light-emitting diodes

Pyrene-based hyperbranched porous polymers with doped Ir(piq)2(acac) red emitter for highly efficient white polymer light-emitting diodes

Ternary complex [Sm(acac)3(5-Br-2,2′-bpy)] for the solution-processed white polymer light-emitting diode (WPLED)

Efficient, stable and high color rendering index white polymer light-emitting diodes by restraining the electron trapping

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